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A Study on Impact Assessment for Application of Strengthened Compliance Concentration of Effluent Limit from PSTWs in the Jinwee-stream Watershed

Dong-Hwan Jeong 1,  Cho Yang Seok 1,  Ki Hong Ahn 1,  Ji-Chul Ryu 1,  안경희 1,  Hyen-Mi Chung 1,  권오상 1

1국립환경과학원

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ABSTRACT

The different compliance concentration of effluent limit is applied to effluent discharged from public sewage treatment works(PSTWs) in each watershed on the basis of water quality thereof in accordance with the enforced Watershed Sewer System Maintenance Plan in 2013. It is necessary to set the compliance concentration of effluent limit for PSTWs in watershed sewer system, in order to achieve water quality criteria for regional watersheds or target water quality under TMDL program. Watershed Environmental Agencies establish the Watershed Sewer System Maintenance Plan and set the compliance concentration of effluent limit for PSTWs under the plan. The agencies have a plan to apply strengthened effluent BOD concentration limits for PSTWs in Ⅰ to Ⅳ area grade, respectively. Effluent BOD concentration limits will be strengthened from 5~10 mg/L to 3 mg/L in Ⅱ~Ⅲ area grade, from 10 mg/L to 5 mg/L in Ⅳ area grade. Uniform application of effluent BOD concentration limits to PSTWs in the watershed sewer system need to be complemented considering type of sewage treatment technology employed and watershed characteristics. Therefore, this study presents assessment methodology which analyze for the compliance concentration of effluent limit to affect water quality of discharge watershed using simulation model for the Jinwee-stream watershed.

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